Bristle strip and brush comprising such a bristle strip



April 18, 1967 c. T-M MANBERG 3,314,097

BRISTLE STRIP AND BRUSH COMPRISING SUCH A BRISTLE STRIP Filed Feb. 7, 1966 2 Sheets-Sheet 1 5o 1+0 50 I M5 1 v 1. \Lb 5b 4b April 18, 1967 c. T-M MANBER 3,314,097

BRISTLE STRIP AND BRUSH COMPRISING SUCH A BRISTLE STRIP Filed Feb. '2, 1966 2 Sheets-Sheet FIGA [/VVE/I/fO/E a (fa/4 2456 (7 M M/ BE/Qq United States Patent 3,314,097 BRISTLE STRIP AND BRUSH COMPRISING SUCH A BRISTLE STRIP Charles T-M Manberg, Huskvarna, Sweden, assignor to Aktiebolaget Husqvarna Borstfabrik, Huskvarna, Sweden, a Swedish joint-stock company Filed Feb. 7, 1966, Ser. No. 525,449 Claims priority, application Sweden, Feb. 19, 1965, 2,143/ 65 6 Claims. (Cl. 15-182) This invention relates primarily to a bristle strip of the kind set forth in the introductory portion of claim 1. The characteristic feature of such bristle strips resides therein, that the bristle of certain portions of the brush is more extensively spread in directions perpendicular to the bristle strip than is the bristle of the strip located between said portions.

In a known bristle strip of this kind, such as disclosed in the British patent to Droeser, 862,359, of Mar. 9, 1961, the extension of the interspace between adjacent flaps located on one and the same side of the longitudinal central plane of the bristle strip is shorter than the flaps, so that adjacent flaps located on opposite sides of the longitudinal central plane of the bristle strip overlap each other when the bristle strip is given its channel shape by being bent round the core or anchoring wire. Due to this overlapping bristle located between the mutually overlapping fiaps is compressed towards the longitudinal central plane of the bristle strip, whereas the remainder of the bristle is deflected laterally, away from said central plane alternately towards the one and the other side, respectively. On account hereof the bristle strip attains a pronounced wavy or zigzag shape which necessitates an accurate synchronization without phase displacement between adjacent turns of the bristle strip when cylindrical brushes are produced through the winding of such a bristle strip in a tight helix around a brush body. On account of the necessity of synchronization without phase displacement between adjacent turns of the strip such a bristle strip is not suitable for the manufacture of frusto-conical brushes.

The principal object of the invention is to provide a bristle strip which does not suffer from the above drawbacks and has a smoother and less tortuous appearance and therefore is more suitable for the manufacture of frusto-conical brushes. This object is attained primarily by designing the bristle strip as set forth in the characterizing clause of the head claim.

The invention also relates to a preferably frusto-conical or cylindrical brush manufactured of such a bristle strip.

Other features and advantages of the bristle strip and the brush according to the invention will appear from the following description and the accompanying drawings which diagrammatically and as non-limiting examples illustrate a preferred embodiment of the invention and in which:

FIGURE 1 is a plan view of a so-called strips rail which is comprised in the bristle strip according to the invention;

FIGURE 2 is a side view on a smaller scale of a length of a bristle strip according to the invention;

FIGURE 3 is a longitudinal section along line IIIIII in FIGURE 2 through the bristle; and

FIGURE 4 is a CrOSs sectional view, in principle along line IV-IV in FIGURE 1 and on a larger scale, through a bristle strip according to the invention.

The bristle strip is comprised of a strips rail 1, an anchoring or core wire 2 and bristle 3. The strips rail is constituted of a longitudinal strip of sheet iron in the two longitudinal edges of which flaps 4a and 4b respectively are arranged with interspaces 5a and 517 respectively therebetween (FIGURE 1). As is apparent from the figure the flaps 4 as well as the interspaces 5 are rec- 3,314,097 Patented Apr. 18, 1967 tangular, the extension of the flaps rection of the strips rail (or bristle that of the interspaces.

Each flap 4a, 4b on the one side of just opposite an interspace other side of the strip. In the illustrated example the extension of the flaps 4a, 4b is half as long as that of the interspaces 5a, 5b, so that the two outer quarters of each interspace 5a, 512, that is the two portions thereof which are located nearest to the respective one of two adjacent flaps 4a, 4b, are located just opposite a corresponding outer quarter of its respective one of two adjacent interspaces 5a, 5b respectively on the opposing longitudinal side of the strip.

In the manufacture of the bristle strip, bristle 3 is arranged transversely on the strips rail 1, preferably substantially perpendicularly to the strips rail, and in such a manner that the middle of each bristle wire becomes located approximately on the longitudinal central axis of the strips rail. After that the core wire 2 is arranged upon the bristle 3, along the central axis of the rail, which is then bent to the channel shape shown in FIGURE 4, so that the bristle is clamped firmly between the anchoring wire 2 and the strips rail 1, the flaps 4a, 4b of which are curved outwards at their outer ends and also bent in towards and preferably beyond the central longitudinal plane of the bristle strip, so that every flap deflects the bristle located just opposite it in the transverse direction of the strip. Hereby a spreading of the bristle is attained, which is more pronounced where a flap 4a, 4b is located just opposite an opposing interspace 5b, 5a respectively than where the ends of an interspace 5a, 5b are each located just opposite one of the near ends of two adjacent, opposing interspaces 5b, 5a respectively. In the last mentioned sections which are represented for example by the line 6 in FIGURES l and 3, the bristle is accordingly spread out centrally of the bristle strip as well as laterally thereof.

It is possible to produce a cylindrical or frusto-conical brush by disposing a plurality of turns, which may either be continuous and form a helix or consist of individual rings, of a bristle strip according to the invention tightly together on a cylindrical or frusto-conical brush body, and brushes manufactured in this way are, of course, within the scope of the invention.

Beside the above advantages in respect of the manufacture of brushes of the bristle strip according to the invention, the same brings about the advantage that the bending forces acting upon the wires of the bristle are reduced, since at least part of the wires in brushes according to the invention will be bent relatively little in two points instead of being bent relatively much in only one point.

The embodiment described above and illustrated in the drawing is, of course, only to be considered as a nonlimiting example and may, as to its details, be modified in several ways within the spirit and scope of the following claims.

What is claim is:

1. A bristle strip comprising:

a substantially channel-shaped longitudinal rail;

U-shaped bristles seated transversely of the rail and extending longitudinally of the rail so that the bristles are substantially aligned to receive an anchoring Wire; an anchoring Wire received within the troughs of the -shaped bristles and extending longitudinally of the rail, the channel-shaped logitudinal rail enclosing the anchoring wire and that portion of the bristles located nearest to the wire; and the channel-shaped rail having projecting flaps spaced in the longitudinal distrip) being less than the strip is located 5b, 5a respectively on the at intervals along its longitudinal edges, each flap being positioned opposite an interspace between two adjacent flaps of the other opposing longitudinal edge of the rail and having a width in the longitudinal direction of the bristle strip less than the width in the same direction of the opposite interspace, each flap being bent towards the central longitudinal plane of the bristle strip so as to deflect the bristles located opposite the flap transversely of and away from the central longitudinal plane of the bristle strip whereby bristles located longitudinally between adjacent oppositely disposed flaps remain deflected.

2. The bristle strip defined in claim 1 wherein each flap is substantially uniformly bent about an axis substantially parallel to the channel-shaped rail.

3. The bristle strip defined in claim 1 wherein the width of each flap is approximately half the width of the oppositely disposed interspace.

4. The bristle strip defined in claim 1 wherein the flaps are bent outwardly away from the central longitudinal plane of the rail at their outer end portions.

5. The bristle strip defined in claim 1 wherein the inner extents of the flaps, which are bent towards the central longitudinal plane of the bristle strip, intersect this central plane.

6. A brush comprising:

a brush holder; and

a continuous bristle strip wound helically around the brush holder, said bristle strip comprising a substantially channel-shaped longitudinal rail; U-shaped bristles seated transversely of the rail and extending longitudinally of the rail so that the bristles are substantially aligned to receive an anchoring wire; and anchoring wire received within the troughs of the U-shaped bristles and extending longitudinally of the rail, the channel-shaped longitudinnal rail enclosing the anchoring wire and that portion of the bristles located nearest to the wire; and the channel-shaped rail having projecting flaps spaced at intervals along its longitudinal edges, each flap being positioned opposite an interspace between two adjacent flaps of the other opposing longitudinal edge of the rail and having a width in the longitudinal direction of the bristle strip less than the width in the same direction of the opposite interspace, each flap being bent towards the central longitudinal plane of the bristle strip so as to deflect the bristles located opposite the flap transversely of and away from the central longitudinal plane of the bristle strip whereby bristles located longitudinally between adjacent oppositely disposed flaps remain deflected.

References Cited by the Examiner UNITED STATES PATENTS 2,790,985 5/1957 Harlan 15-183 FOREIGN PATENTS 862,359 3/1961 Great Britain.

CHARLES A. WILLMUTH, Primary Examiner. PETER FELDMAN, Assistant Examiner. 

1. A BRISTLE STRIP COMPRISING: A SUBSTANTIALLY CHANNEL-SHAPED LONGITUDINAL RAIL; U-SHAPED BRISTLES SEATED TRANSVERSELY OF THE RAIL AND EXTENDING LONGITUDINALLY OF THE RAIL SO THAT THE BRISTLES ARE SUBSTANTIALLY ALIGNED TO RECEIVE AN ANCHORING WIRE; AN ANCHORING WIRE RECEIVED WITHIN THE TROUGHS OF THE U-SHAPED BRISTLES AND EXTENDING LONGITUDINALLY OF THE RAIL, THE CHANNEL-SHAPED LONGITUDINAL RAIL ENCLOSING THE ANCHORING WIRE AND THAT PORTION OF THE BRISTLES LOCATED NEAREST TO THE WIRE; AND THE CHANNEL-SHAPED RAIL HAVING PROJECTING FLAPS SPACED AT INTERVALS ALONG ITS LONGITUDINAL EDGES, EACH FLAP BEING POSITIONED OPPOSITE AN INTERSPACE BETWEEN TWO ADJACENT FLAPS OF THE OTHER OPPOSING LONGITUDINAL EDGE OF THE RAIL AND HAVING A WIDTH IN THE LONGITUDINAL DIRECTION OF THE BRISTLE STRIP LESS THAN THE WIDTH IN THE SAME DIRECTION OF THE OPPOSITE INTERSPACE, EACH FLAP BEING BENT TOWARDS THE CENTRAL LONGITUDINAL PLANE OF THE BRISTLE STRIP SO AS TO DEFLECT THE BRISTLES LOCATED OPPOSITE THE FLAP TRANSVERSELY OF AND AWAY FROM THE CENTRAL LONGITUDINAL PLANE OF THE BRISTLE STRIP WHEREBY BRISTLES LOCATED LONGITUDINALLY BETWEEN ADJACENT OPPOSITELY DISPOSED FLAPS REMAIN DEFLECTED. 